activity
20082026
most citedGravitational detection of a low-mass dark satellite at cosmological distance

386 citations · 4.3k across the 78 of their papers we have counts for

collaborators

79 papers

astro-ph.CO2026

On what scales does strong lensing robustly constrain the mass profile of low-mass perturbers?

Maryam Tajalli, Simona Vegetti

Galaxy-galaxy strong gravitational lensing is an established method to detect and characterise low-mass haloes, which are otherwise too faint to be directly observed. Recent analys…

astro-ph.GA2025★ 3 cited

An extended and extremely thin gravitational arc from a lensed compact symmetric object at redshift 2.059

J. P. McKean, C. Spingola, D. M. Powell +1

Compact symmetric objects (CSOs) are thought to be short-lived radio sources with two lobes of emission that are separated by less than a kpc in projection. However, studies of suc…

astro-ph.CO2025★ 14 cited

A million-solar-mass object detected at cosmological distance using gravitational imaging

D. M. Powell, J. P. McKean, S. Vegetti +3

Structure on sub-galactic scales provides important tests of galaxy formation models and the nature of dark matter. However, such objects are typically too faint to provide robust…

astro-ph.GA2025★ 1 cited

Investigation of mass substructure in gravitational lens system SDP.81 with ALMA long-baseline observations

H. R. Stacey, D. M. Powell, S. Vegetti +2

The prevalence and properties of low-mass dark matter haloes serve as a crucial test for understanding the nature of dark matter, and may be constrained through the gravitational d…

astro-ph.CO2025★ 6 cited

SHARP -- IX. The dense, low-mass perturbers in B1938+666 and J0946+1006: implications for cold and self-interacting dark matter

Maryam Tajalli, Simona Vegetti, Conor M. O'Riordan +5

We present an extended analysis of the gravitational lens systems SDSS J0946+1006 and JVAS B1938+666. We focus on the properties of two low-mass dark matter haloes previously detec…

astro-ph.GA2025★ 15 cited

Euclid: A complete Einstein ring in NGC 6505

C. M. O'Riordan, L. J. Oldham, A. Nersesian +195

We report the discovery of a complete Einstein ring around the elliptical galaxy NGC 6505, at . This is the first strong gravitational lens discovered in Euclid and the fi…